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. 2017 Aug 11;7:7865. doi: 10.1038/s41598-017-07609-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Distribution of pH_e values in intratumoral (gray bars) and peritumoral (black bars) regions for untreated (A) and TMZ treated (B) U251 tumors. Average pH_e values (±SD) for intratumoral and peritumoral regions in untreated and TMZ treated U251 tumors (C) show that the average pH_e value for intratumoral voxels is significantly lower in untreated tumors compared to treated tumors (*p = 0.001).